David m



(No Model.)

D. M. BYE.

DUPLEX PEN.

No. 600,511. Patented Mar. 15,1898.

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NlTED STATES PATENT FFICE.

DAVID M. EYE, OF MIDLAND, MICHIGAN, ASSIGNOR OF ONE-HALF TO FLOYD L. POST, OF SAME PLACE.

DUPLEX PEN.

SPECIFICATION forming part of Letters Patent No. 600,511, dated March 15, 1898.

Application filed April 20, 1897. Serial No. 633,000. (No model.)

To all whom it may concern:

Be it known that I, DAVID M. BYE, a citizen of the United States, residing at Midland, in the county of Midland and State of Michigan, have invented a new and useful Duplex Pen, of which the following is a specification.

This invention relates to certain improvements in fountain-pens, its object being to provide a fountain-pen with a supplemental 1o slidable penholder which may be used to support a pen-point for use with ink of a different color from that contained in the fountainpen.

VVith this object in view the invention consists of the novel features of construction and combination of parts hereinafter fully described, and particularly pointed out in the claims.

In the drawings, Figure 1 is a perspective view of a fountain-pen embodying my invention, showing the supplemental holder withdrawn into inoperative position. Fig. 2 is a plan view of the same, showing the supplemental holder extended for use. Fig. 3 is a 2 5 transverse section through the barrel of the fountain-pen. Fig. 4 is a perspective view of the supplemental holder detached.

Similar reference-numerals indicate similar parts in the several figures.

1 indicates the barrel of an ordinary fountain-pen, which is provided with the usual pen-point and feed mechanism and which forms no part of my present invention. The upper side of the barrel (or that part of the 3 5 barrel which is upper when the pen is being used) is provided with a longitudinal groove 2, the side walls 3 of which are undercut. This groove opens out at the front end of the barrel and preferably extends back as far as the annular flange 4, usually formed near the end of the barrel.

5 represents a sliding bar having a dovetail portion 6 to fit in the groove 2 and having its upper face rounded, as indicated at 7, to cor- 5 respond with the transverse curvature of the barrel of the pen. The sliding bar is provided with an upwardly-projecting fingerpiece 9 at its front end, and this finger-piece is provided with a concave recess 10 in its upper face adapted to receive the end of the forefinger of the user of the pen, as will be referred to hereinafter. Preferably this fingerpiece will be secured to the bar 5 by a screw 11; but it may be otherwise secured to the bar or be integral with it, as preferred. 12 represents an ordinary pen-point removably secured between the ends of the bar 5 and the finger-piece 9 in a similar manner in which pen-points are secured in an ordinary penholder. The pen-point may, however, be secured to the bar in any other desired manner. The sliding bar 5 is preferably of such length that when in its retracted position with its rear end engaging the cap 4: the extreme end of the pen-point will be entirely out of the way when the writer is using the fountain pen, say about half an inch to the rear of the extreme end of the fountain-pen, or more, if desired. I

In use the fountain-pen will be charged with ink of any desired colon-say red and the pen-point 12 will be dipped in ink of another colorsay blackand it is obvious the pens may be used alternately, as desired, on work where it is necessary to use two different-colored inks. In order to move the sliding bar in or out of position, the writer will hold the fountain-pen between the thumb and second finger in the manner it is usually held when writing and then place the end of his forefinger in the concave recess 10 in the finger-piece 9, when by moving the forefinger in the desired direction the sliding bar will also move as desired. \Vhen writing with the pen-point 12, the writers forefinger will engage the finger-piece 9, and thus prevent the backward-sliding movement of the bar 5. The upward pressure on the front end of the bar 5, caused by writing with the point 12, will increase the friction between the bar and the walls 3 of the groove and still further aid in preventing the backward-sliding movement of the bar in the groove.

A pen made in accordance with my invention will be very useful to bookkeepers in posting books and will save much time that is usually lost in laying down one pen and finding another when it is necessary to use a different-colored ink. It will require very little time to move the sliding bar of my in1- 10o much valuable time will be saved by the use of my invention.

It is obvious that pens made in accordance with my invention may be used for records or writing of any description Where two different-colored inks are required, and it is also obvious that inks of any color may be used as desired.

The sliding bar may be of any desired materialsuch as rubber, Wood, or metal-possessing the requisite stiffness or rigidityvfor the purpose contemplated, and it is to be understood that changes in the form,proportion, and minor details of construction may be resorted to Without departing from the spirit or sacrificing any of the advantages of this invention.

Having thus described the invention, what I claim is 1. The combination with a fountain-pen provided With the usual pen-point and having a longitudinal groove in its outer periphery, said groove having undercut sides, of a sliding bar having a dovetail portion to fit in said groove, and a supplemental pen-point secured to the outer end of said bar, substantially as described.

2. The combination with a fountain -pen provided with the usual pen-point and having a longitudinal groove in its outer periphery, said groove having undercut sides, of a sliding bar having a dovetail portion to fit in said groove, an upwardly-projecting fingerpiece at the front end of said bar, and a supplemental pen-point secured to the front end of said bar, substantially as described.

3. The combination with a fountain-pen provided with the usual pen-point and having a longitudinal groove in the upper side of the barrel, said groove having undercut sides,

the outer end of the said bar, and a supple- 'mental pen-point removably secured to the outer end of the sliding bar, substantially as described.

5. The'combination with a fountain-pen provided With the usual pen-point and having a longitudinal groove in its outer periphery,of a bar slidingly supported in said groove,

a finger-piece secured to the outer end of said bar and provided with a concave recess in its upper face, and a supplemental'pen-point secured to the outer end of said bar, substantially as described.

' 6. The combination with a fountain-pen provided with the usual pen-point and having a longitudinal groove, of a bar slidingly supported in said groove, a finger-piece secured to the outer end of the sliding bar, and a supplemental pen-point removably secured between the ends of the sliding bar and the finger-piece, substantially as described.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two Witnesses.

DAVID M. BYE.

WVitnesses: S. D. SHAFFNER,

H. M. SNELL. 

